Burger balloon



FIG. 1 is an isometric view of a burger balloon showing my new design;

FIG. 2 is a first side-elevational view thereof;

FIG. 3 is a second side-elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a burger balloon, as shown and described. 